Gas Phase Transport, Adsorption and Surface Diffusion in Porous Glass Membrane

0028711 - UCHP-M 20050166 RIV NL eng J - Journal Article
Yang, J. - Čermáková, Jiřina - Uchytil, Petr - Hamel, Ch. - Seidel-Morgenstern, A.
Gas Phase Transport, Adsorption and Surface Diffusion in Porous Glass Membrane.
[Transport plynů, adsorpce a povrchová difúze v porézní skleněné membráně.]
Catalysis Today. Roč. 104, 2-4 (2005), s. 344-351. ISSN 0920-5861. E-ISSN 1873-4308.
[International Conference on Catalysis in Membrane Reactors /6./. Lahnstein, 06.07.2004-09.07.2004]
R&D Projects: GA AV ČR(CZ) IAA4072402
Institutional research plan: CEZ:AV0Z40720504
Keywords : gas phase transport * vycor glass * adsorption
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 2.365, year: 2005

Due to their improved performance and excellent chemical resistance there is a growing interest in applying inorganic membrane not only for gas separation but also in combination with heterogeneous catalysts in membrane reactors. The objective of this work is to study the mass transfer through a Vycor glass membrane which might be applied successfully in membrane reactors. Transient diffusion experiments were carried out in which two different gases were exchanged via the membrane. If adsorbable gases are involved there is a strong asymmetry between corresponding exchange experiments. In order to analyze the transient diffusion experiments a transport model was applied which is based on the Dusty Gas Model for the quantification of gas phase transport and on the generalized Stefan-Maxwell theory for the description of the transport of adsorbed species. The model describes relatively well exchange experiments performed with H2 and N2 or He and CO2.

Důvodem studie transportu látek ve Vycorové membráně je možnost jejího úspěšného použití jako materiálu pro membránový reaktor. Difúzní experimenty za neustálených podmínek byly prováděny ve Wicke-Kallenbachově cele, kde dva plyny byly zaměňovány přes membránu. Pokud byly použity adsorbovatelné plyny objevila se silná asymetrie mezi odpovídajícími si výměnnými experimenty. Pro vyhodnocení experimentů byl použit Dusty Gas model pro transport plynu a obecná Stefan-Maxwellova teorie pro popis transportu adsorbovaných složek. Model popsal velmi dobře transport H2, N2, He a CO2.
Permanent Link: http://hdl.handle.net/11104/0118627